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Refurbished Replacement Column (Sieve Bed) are regular replacement parts for Inogen One G3 Oxygen Concentrator. The Inogen One Oxygen Concentrator is used on a prescriptive basis by patients requiring supplemental oxygen. It supplies a high concentration of oxygen and is used with a nasal cannula to channel oxygen from the concentrator to the patient. The Inogen One Oxygen Concentrator may be used in a home, institution, vehicles and various mobile environments.

The subject device is a compatible replacement part of the Inogen One G3 portable oxygen concentrator. ("POC"). Standard portable oxygen concentrators generate oxygen from room air by use of a sieve bed that removes nitrogen, other gases and impurities from the room air and generates oxygen for patients requiring supplement oxygen. These sieve beds must be replaced on a schedule in order to maintain the POC's ability to deliver the require % oxygen. The subject device is refurbished with existing Inogen One G3 components with a new sieve bed. The final product is equivalent to the Inogen one G3 replacement sieve bed cartridge.